Peoria (IL)
September
Weather in Peoria, Illinois for September 2026
Your guide to Peoria weather in September - trends and predictions
So far, September 2026 in Peoria is slightly warmer than the historical average by 1.1 °F.
The forecast for the next days in Peoria predicts temperatures to be around 19 °F, close to the historical average.
In general, the average temperature in Peoria at the beginning of September is 28.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.7 °F by the end of September.
Peoria experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 112.9 mm.
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Temperatures
Rain 🌧️
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24
Dry days
6
Rainy days
0
Snow days
27°/14°
Temperatures
17 km/h
Avg max wind
64 %
Avg humidity
Peoria Weather September
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Temperatures trend during September in Peoria
See the weather trend as well as the moving average line
September weather in Peoria day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 31° /16° | 0 mm | 7 | |
| Sept. 2 | Sunny | 30° /15° | 0 mm | 7 | |
| Sept. 3 |  Partly cloudy | 31° /15° | 33.2 mm | 7 | |
| Sept. 4 | Sunny | 30° /14° | 0 mm | 7 | |
| Sept. 5 |  Mist | 30° /17° | 0 mm | 7 | |
| Sept. 6 | Partly cloudy | 25° /13° | 0 mm | 6 | |
| Sept. 7 | Sunny | 24° /8° | 0 mm | 6 | |
| Sept. 8 | Sunny | 27° /9° | 0 mm | 6 | |
| Sept. 9 | Sunny | 26° /13° | 18.3 mm | 5 | |
| Sept. 10 | Sunny | 28° /14° | 31.6 mm | 5 | |
| Sept. 11 | Sunny | 31° /15° | 0.1 mm | 7 | |
| Sept. 12 | Sunny | 31° /15° | 0.1 mm | 7 | |
| Sept. 13 |  Overcast | 28° /17° | 0.4 mm | 6 | |
| Sept. 14 |  Patchy rain possible | 31° /16° | 0 mm | 7 | |
| Sept. 15 |  Cloudy | 32° /19° | 1 mm | 5 | |
| Sept. 16 | Sunny | 31° /18° | 4.7 mm | 6 | |
| Sept. 17 | Sunny | 30° /15° | 5.7 mm | 6 | |
| Sept. 18 | Sunny | 29° /15° | 6.1 mm | 6 | |
| Sept. 19 | Partly cloudy | 28° /16° | 1.8 mm | 5 | |
| Sept. 20 | Overcast | 23° /16° | 1.2 mm | 5.8 | |
| Sept. 21 | Patchy rain possible | 19° /14° | 2 mm | 0.6 | |
| Sept. 22 | Patchy rain possible | 15° /13° | 0.6 mm | 0.9 | |
| Sept. 23 | Overcast | 20° /12° | 0.2 mm | 5.7 | |
| Sept. 24 | Overcast | 21° /12° | 0 mm | 5 | |
| Sept. 25 | Patchy rain possible | 20° /14° | 1.5 mm | 5 | |
| Sept. 26 | Overcast | 22° /13° | 0.1 mm | 6 | |
| Sept. 27 | Overcast | 23° /17° | 0 mm | 6 | |
| Sept. 28 | Overcast | 18° /8° | 11.5 mm | 4 | |
| Sept. 29 | Sunny | 14° /6° | 0 mm | 4 | |
| Sept. 30 | Sunny | 20° /10° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Peoria in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Peoria forecast closer to your planned date for the most up-to-date weather information.
Change Month
Peoria in September - FAQ
What are the expected maximum and minimum temperatures in Peoria during September?
Enjoy moderate daytime temperatures of up to 27° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Peoria during September?
Significant rainfall exceeding 112.9 mm is expected in Peoria during September, occurring over more than 6 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Peoria during September?
The average wind speed in Peoria during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Peoria
Explore the daily rainfall trends and prepare for Peorias September weather 💧
Typically, Peoria has 6 rainy days in September with a total of 112.9 mm of rainfall.
UV exposure in Peoria during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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